Nando's Fraud Beware : eBay Guides

I tried to use the nando's whole chicken voucher bought on ebay at my local branch and was treated like a criminal, the manager was called and started questioning me, I was asked where I had got them from? which branch had stamped them? and was told that they were getting many of these vouchers in and that they did not recognise any of the staff members initials or names, so could not accept them.

I was told to use them in the branch I had got them from (which obviously I cannot as they are from ebay) and refused to accept them.

Now I cannot even go back into my local nando's from the pure shame and embarrassment of it all and would like to warn others before they decide to buy.